<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul id = "ul">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
    <script>
        // let li = document.querySelectorAll('li')
        // for(let i of li) {
        //     i.addEventListener('click',() => {
        //         console.log(i.innerHTML);
        //     })
        // }
            // 事件代理
            let ul = document.getElementById('ul')
            ul.addEventListener('click',(e) => {
                console.log(e.target.innerText);
            })
    </script>
</body>
</html>